First dissipationless Chern insulator exhibits exotic fractional quantum anomalous Hall effect without an external magnetic field

https://phys.org/news/2026-02-current-loss-newly-fractional-quantum.html

"2 layers molybdenum ditelluride twisted at specific angle suffers from energy lost as heat... overcome using: horizontal flux growth increasing charge-carrier mobility >10X, refined fabrication significantly reducing twist-angle disorder between layers... when tuned to 2/3rd filling electronic state, resistance nearly vanished/ electricity flowed along material's edges with essentially no energy loss... unlike standard quantum Hall states, energy gap decreased as magnetic field was applied... low-power quantum devices"